Unauthorised deductions from Vodacom Live

Vodacom has been deducting money on my account without authorisation for a few months. Something I see is fairly commonplace given the number of negative reviews here. I've phoned Vodacom on 5 occasions to resolve this ***** (let's call it what it is) and been assured that my query is being escalated each time with absolutely nothing happening after. It's theft as far as I'm concerned.